Copy apparatus

ABSTRACT

A diazotype copy machine including a developer unit having an applicator roller for applying developer to a copy sheet and means for dispensing a substantially uniform coating of developer onto the surface of said applicator roller including means movable toward and away from contact with said applicator roller between an engaged and a released position. Control means is provided for moving said dispenser means between said engaged and said released position and drive means is provided for normally driving said roller in one direction to make copies. Said drive means includes slip clutch means permitting free rotation of said applicator roller in said one direction relative to said drive means, and means is provided for reversing said drive means whereby said applicator roller may be freely rotated in both directions to facilitate removal of a copy sheet jam around said roller.

[451 Nov. 7, 1972 Primary Examiner-Samuel S. Matthews AssistantExaminer-Richard L. Moses Attorney-Richard D. Mason et al.

[57] ABSTRACT A diazotype copy machine including a developer unit havingan applicator roller for applying developer to a copy sheet and meansfor dispensing a substantially uniform coating of developer onto thesurface of said applicator roller including means movable toward andaway from contact with said applicator roller between an engaged and areleased position. Control means is provided for moving said dispensermeans between said engaged and said released position and drive means isprovided for normally driving said roller in one direction to makecopies. Said drive means includes slip clutch means permitting freerotation of said applicator roller in said one direction relative toJohn S. Copeland, Buffalo Grove, 111. [73] AssigneeAddressograph-Multigraph Corporation, Mt. Prospect, Ill.

July 8, 1971 .95/89 R, 95/89 A, 118/261, 35 5/ 1 06 .G03d 3/00, G03b27/30 Field of Search....'.9 5/89 R, 89 A; 355/100, 106, 355/107;118/261, 247, 248

References Cited- UNITED STATES PATENTS 71 8 AR X 1299 08 6 SOD/I12 5155N/ 3.199 "00 u u nnumn mm m m n a L m t lnu numtau r at" hak 6 m wcmoB03300 GNNLGK 452005 645667 999999 111111 l/l/l/ 005002 2 111 5242733100173 bow/0 9 3 5550006 4 70 22 ,36 .3 322333 United States PatentCopeland [s4] COPY APPARATUS [72] Inventor:

[22] Filed:

21] Appl.No.: 160,618

said drive means, and means is provided for reversing said drive meanswhereby said applicator roller may be freely rotated in both directionsto facilitate removal of a copy sheet jam around said roller.

12 Claims, 4 Drawing Figures PATENTEnuuvmn 3.702.096

sum 2 M2 I 180 [J84 J86 v 209 JZQ COPY APPARATUS BACKGROUND OF INVENTIONThis invention relates generally to apparatus for developing diazotypecopymaterial and more particularly to apparatus of the above-mentionedtype which applies a liquid developing agent in metered quantities toexposed diazo sensitized copy material, thereby to producedry-to-the-touch developed copies. The

present invention is an improvement on the diazotype copy apparatusdisclosed in the copending US. Pat. application Ser. No. 31,939, filedApr. 27, 1970, and assigned to the same assignee asthis application.

In the copending application there is disclosed a diazotype copy deviceincluding developing apparatus therein comprising an applicator rollerwhich has a uniquely prepared surface adapted to receive and carry alimited quantity of developer fluid.

Adjacent the surface of the applicator roller and extending the lengthof and parallel thereto, is a pressure applying blade mounted fortangential engagement with the roller surface, the area between theblade and roller surface forming a copy material developing zone.v Asecond, fluid metering blade is also mounted for tangential engagementwith the surface of the applicator roller. The second blade is mounted180 around the circumference of the applicator roller from thefirstmentioned blade to equalize the forces applied to the roller. Afluid carrying member substantially equal in length to the applicatorroller, is located in the area between the fluid applying blade and theapplicator roller. A series of holes is formed in the member, from whichfluid is pumped onto the metering blade member. The fluid is dispersedby the blade member over the surface of the roller, and the excess fluidwiped from the roller surface by the fluid metering blade is carriedinto a trough beneath the applicator roller.

To insure the uniform dispersion of developing fluid over the rollersurface and to prevent fluid droplets from building up in the developingzone between the applicator roller surface and the pressure applyingblade, provision is made to move the pressure applying blade intoengagement with the roller surface a predetermined time after engagementof the wiper blade with the roller surface, sufficiently long to meter auniform layer of fluid onto the roller surface. The latter isaccomplished automatically by means of a novel electrical circuit andcontrol-linkage arrangement upon energization of the power switch of thedeveloper apparatus. The blades are likewise removed sequentially fromcontact with the roller surface upon de-energization of the apparatus.Removal of the blades from contact with the applicator roller surfacewhen the developing apparatus in not in use prevents marking of theroller surface by the blades which could deterimentally afiect thequality of subsequent copies produced by the apparatus. v

SUMMARY OF THE INVENTION does happen itis difficult to remove thewrapped up paperfrom the roller without extensive time and effort. It isdesirable, and an object of the invention to provide a new and improveddiazotype copy apparatus of the character described having selectivemeans permitting the fluid application roller to rotate in both forwardand reverse directions for the purpose of aidingin the removal of paperjams, and the like.

It is another object of the present invention to provide an effectivemeans for aiding in the removal of a wrapped up paper jam around theapplication roller which means permits clearing of a paper jam rapidlyand easily. Another object of the invention is to provide a new andimproved diazotype copy developer of the character described havingmeans for driving the roller in a reverse direction, thereby permittingfree wheeling hand rotation of the roller in either direction to clear apaper jam therefrom.

Briefly, a preferred embodiment of the new and improved copyingapparatus of the present invention employs an overrunning slip clutchinthe drive train between the applicator roller and its drive motor,which clutch normally drives the roller in one direction when the motoris energized in an operating mode. Means is provided for reversing thedirection of driving torque applied to the roller, thereby permittinghand I rotation of the roller in either direction in order to relieve apaper jam thereon. The reversing means includes circuitry for insuringthat the blades or other means for dispensing fluid to the roller andproviding pressure contact for copying are moved out of engagement withthe applicator roller before reverse torque is applied to the roller.The circuitry insures that the paper jam is easily and rapidly clearedup without the danger of tightening the jam by inadvertent reverserotation of the roller with the. blades still engaged therewith. v

DESCRIPTION OF THE DRAWINGS A better understanding of the presentinvention and its organization and construction may be had by referringto the description below in conjunction with the accompanying drawingswherein:

FIG. 1 is a vertical sectional view of a diazotype copying machineconstructed in accordance with the features of the present invention;

FIG. 2 is an enlarged, fragmentary, perspective view of the metering andpressure applying blades of the developing apparatus and the applicatorroller and drive therefor;

FIG. 3 is a schematic diagram of the electrical circuitry forcontrolling the operation of the developer apparatus in accordance withthe features of the present invention; and

FIG. 4 is an end elevational view with portions in section and inphantom showing another embodiment of a diazotype copying machineconstructed in accordance with the features of the present invention.

DETAILED DESCRIPTION Referring now to the drawings more in detail, FIG.1 illustrates a new and improved diazotype copying machine 10, includingdeveloping apparatus 12 according to the features of the presentinvention. The copying machine comprises a housing 14 including frontand rear walls 16, 18, upper and lower walls 20, 22, and sidewalls 24interconnecting the upper, lower, front and rear walls. A lower section28 of the housing en'- cases a .copy sheet exposure apparatus 30 forexposing a diazo-sensitized copy sheet to light while the copy sheet isin surface-to-surface contact with an original tracing, for the purposeof imaging the copy sheet.

The copy sheet exposure apparatus comprises a rotatable lamp 32 havingan outer surface 34 on which is carried a sandwiched copy sheet and anoriginal tracing (not shown) for exposure of the former. An endless belt36 extends around a portion of the outer surface of the lamp 32 and istrained for movement around a path defined by rollers 38, 40, and 42. Asmaller roller 44 provides tension to the belt 36 to insure that thelatter is in close contact with the lamp 32.-

The sandwiched original tracing and copy sheet are fed over 'a shelf 45into an entrance 46 adjacent roller 42 between belt 36 and the outersurface 34 of lamp 32. The original and copy sheet are carried aroundthe lamp 32 and are discharged at an exit 48 adjacent the roller 38. Atthis point, the copy sheet, has been exposed and is then separated fromthe original tracing, ready for development.

lnan upper section 50 of the copying machine housing 14, there isprovided an embodiment of the developing apparatus 12 comprising anapplicator roller 52 having a central shaft portion 54 of the metal andan outer or peripheral layer 56 of a smooth, nonporous, resilientmaterial, such as rubber. The outer surface (indicated as 58) of theperipheral layer 56 is specially prepared to form a developer fluidcarrier surface havingirregular depressions of varying depths and sizes,as described in the detailed description thereof in the aforementionedcopending application, which is hereby incorporated herein by reference.

The roller 52 is supported for rotation at opposite ends of the shaft 54in suitable bearings (not shown) mounted on inner sidewalls 64 in thehousing 14. A drive shaft extension 72 coaxially aligned with the rollershaft 54 is rotated through a sprocket wheel 74 and drive chain 75. Adrive motor (not shown) provides the power for driving the applicatorroller 52 in a clockwise direction through a suitable gear reducer (notshown) and the endless chain 75 connected to the aforementioned sprocketwheel 74 (FIG. 2). The sprocket wheel 84 and. shaft 72 are drivinglyinterconnected to the roller 52 through a one-way drive roller clutch78.

The roller clutch provides positive driving engagement between thesprocket 74 and roller 52 when a clockwise differential torque existsbetween the sprocket and roller; however, if the roller rotates fasterthan the sprocket in a clockwise direction, the clutch permits lowfriction overrunning. The clutch also permits the roller to be rotatedin a counterclockwise direction when reverse torque (counterclockwise)is applied to the shaft and sprocket by reversing the direction of thedrive motor. If a paper jam occurs and a copy sheet becomes wound on theroller, reverse torque is applied by reversing the direction of rotationof the rotor, and this permits manual rotation of the roller in eitherdirection to quickly and easily clear the am.

Positioned on opposite sides of roller 52 and spaced 180circumferentially with respect to the roller is a pair of blade members86, 88, respectively. Each of the blade members 86, 88 is mounted on arespective rotatable support taking the form of a tubular shaft 90, 92,by means of a blade holder member 94, 96 attached thereto, respectively.The blades, each fabricated from a flat length of spring steel, or thelike, material are fastened to a respective blade holder member byfasteners, such as bolts 98.

The shafts 90, 92, which are also mounted between the inner sidewalls64, are'rotatable in the direction of the arrows (FIG. 1) to cause blademembers 86, 88 to tangentially engage the-outer cylindrical surface 58of the roller 52, as shown in FIG. 2. When in contact with theroller 52,the blade members are caused to be bowed slightly by the tangentialcontact with the outer roller surface 68, thereby insuring thatcontinuous engagement between blade and roller is maintained withoutskipping. I

A tubularconduit-l00 is mounted on a Z-shaped bracket 102, securedto theblade holder member 94 in order to dispense developer liquid to thesurface 58 of roller 52. Fluid is supplied through a flexible tube (notshown) coupled to' one end of the dispenser conduit 100. A developerfluid pump 108(FIG. 3) and fluid reservoir (not shown) are provided tosupply the fluid developer to the tubular conduit l00under pressure, andthe developer flows through spaced apertures 103 (FIG. 1) onto the blade86. The developer liquid dispensed from the tube flows onto the uppersurface of blade 86, and when the latter makes contact or engagementwith the outer surface 58 of the rotating roller 52, the fluid isevenlyapplied or metered onto the roller surface. The contactingmetering blade member 86, together with the roller 52 having thespecially prepared outer surface 58, delivers a controlled amount ofdeveloper fluid to a copy sheet being developed by contact against the(roller. The blade member 86 wipes away excess developer fluid which inturn runs back into a trough 114 mounted beneath the applicator rollerand metering blade. The excess fluid is channeled through an opening 116in trough 114 (FIG. 1), and through a screenlike filter before beingreturned to the fluid reservoir for reuse. The filter screen serves toremove any minute paper particles which may have found their way intothe developer fluid during the development process and which, if notremoved, could eventually become lodged beneath the blade members,causing streaks along the surface of subsequently developed copy sheets.As previously mentioned, the surface 58 of the applicator roller 52 isof a specially prepared type of material for holding a predeterminedquantity of developer liquid per unit area thereon in order to properlydevelop diazo sensitized copy sheets which are passed in contact againstthe roller.

The texture or finish of the applicator roller 52 is important in theoperation of the developer apparatus 12. The amount of developer fluidretained on the roller surface 58 and carried to the copy sheet beingdeveloped is dependent, on the surface characteristics of the roller. Ithas been found that the surface best suited for carrying the properamount of liquid for development of dry-to-the-touch copy sheets is oneof The limits of fluid application provided by a-properly preparedroller surface reside between 0.5 grams and 3.0 grams per square meterof the copy material. The

' second blade member 88, when engaged with the outer roller surface 58,applies to the latter surface a predetermined contact pressure along aline of contact about 180 around the circumference of theroller andsubstantially equal to the force applied to the'roller by blade member86. The pressure contact area'between the blade 88 and roller forms adeveloping zone 118 v(FIGQl) through which copy sheets are passedto bedeveloped. 7 t y 3 I It is important that the forces applied to theroller surface are substantially equal. If they are not, a tendency forthe roller to shift will be prevalent as well as a possibledisfiguration of the surface of the roller. In

both of the last-mentioned cases, the ultimate quality of copiesproduced in the developer will be affected.

' A copy sheet to be developed is placed in the developing apparatus 12at an entrance 120 and is manually urgedupwardly along curved guidemember 122. The guide member is attached to a boxlike cross member 119in the upper section 50"of the housing 14. The leading edge of the copysheet is gripped between the pressure applying blade member 88 andtheroller 52 and is passed by the rotation of the roller 52 in thedirection indicated by the arrow A. The copy sheet is thus moved throughthe developing zone 118 and developer fluid is applied in printingfashion to the previously imaged copy sheet. The developed copy sheetemerges from the developing appratus 12 at an exit 124 in adry-to-the-touch condition. y g

As mentioned heretofore, the blade members'86,'88 are each mounted onmembers 90, 92 respectively, which can be rotated to cause simultaneousengagement or simultaneous disengagement of the respective blade memberswith. respect to the outer surface 58 of applicator roller 52 Thephysical movement of the blade members is controlled by acontrol-linkage and electrical contact assembly shown in detail in theaforementioned copending patent application incorporated herein byreference. The control-linkage and contact assembly includes acontroHinkage member, preferably taking the form of a cam member havinga generally circular shape and mounted for rotation in coaxial alignmentwith the shaft of an electrically operated control motor which iscapable of being operated in a forward (engage) and reverse (release)direction by means of motor engage and release coils 190 and 216,respectively (FIG. 3). Two pairs of electrical contacts 136a and 136bare mounted adjacent the cam member, and on an opposite side thereof(180 about the circumference of the cam member) is mounted a second setcomprising two pairs of contacts 138a and l38b. The contacts areoperated by means of cam follower rollers connected to the contacts bymeans of leaf springs and each of the rollers rides along the externalsurface or edge of the rotary cam member.

The cam member is constructed to include three outer trackportions,each'having a different, predetermined distance measured along a radiusof thecam member from the center of the latter, and along which theswitch actuating follower rollers ride. As the cam member is rotated,the contact pairs are opened or closed; as the case may be,to' inturn'energize or deenergize the control motor.

As described in the aforementioned copending application,'a pair of armsare connectedto the ends of the respective rotatable tubular shafts" 90,92,in order to translate the rotatable movement of the cam member into adriving force for movement of the blade members86,88 into and out ofengagement with the roller 52. Movement ofthe armsby the cam causes theblades to be moved into or out of engagement with the vapplicator rollersurface 58, depending upon the direction of rotation (clockwise orcounterclockwise) of the cam member. Turningnow to FIG. 3 of thedrawings, there is illustrated therein a preferred embodiment of thecircuit for controlling the movement of the blade members 86, 88 intoand out of engagement with the .applicator roller 52.

The-circuit 170 is powered by a conventional 115 volt AC source (notshown) connected across. terminals 172,174, each terminal'being in turnconnected to a lead 176, 178, respectively. Lead 176 is connected flowvia a lead 183 to operate pump motor 108,

thereby to begin pumping fluid to the tube member 100 (FIG. 1)., Themovement of the switch armature into contact with theterminal 188 alsoprovides current from the A.C. .power source for energizing the drivemotor 76 for rotatin applicator roller 52 through lines 209 and 178. o

The normally open pair of contacts 138a are connected to the terminal184 of the on-off switch 182 via alead 186, and are in series with a cammotor release coil 190 which energizes the cam motor in adirectioncausing the blades 86 and '88 to move out of engagement with theapplicator roller 52. The release coil is connected via leads 192 and194 to the contacts 138a and line 178, respectively.

The line 192 and contact 138a are also connected to a secondarmature 198of the manually operated on-off switch 182 via a lead 191. The secondarmature 198 is normally open with respect to a terminal 200 of theswitch 182. The terminal 200 is connected via a lead wire 202 througha'pair of normally open switch contacts 136b of the first pair of camoperated contacts and via lead 204 to a normally'closed contact 206 of athree second time delay relay 208. The relay includes an armature 207connected to the terminal 188 of the switch 182 via the lead 209. Therelay 208 includes a contact 210 normally open with respect to thearmature 207, and the terminal 210 is connected'via a lead motor in adirection to cause engagement with the blades 86 and88 andthe applicatorroller 52. The normally closed pair of contacts 138b are connected alsovia a lead 218 through the normally closed pair of contacts 136a and theleads 220 and 204 to the normally closed set of contacts 206 of timedelay relay 208.

During normal copy making operation, the roller drive motor 76 isenergized to rotate the applicator roller drive motor 76 is energized torotate the applicator roller 52 in a clockwise direction through theclutch 78. in this mode, current is supplied to the motor through a pairof leads 230 and 232 connected tothe respective switch armatures 234 and236 of a doublepole-double-throw manualreversing switch 238. In order toprotect the drive motor from transient voltages, a thyrector transientsuppressor 240 is connected in parallel across, the leads 230 and 232.

As shown in FIGJS, the manual reversing switch is positioned in thenormal operating position and themmatures 234 and 236 are in contactwith terminals 242 and 244, respectively, which are connected tonegative and positive output leads 246 and 248, respectively, of a speedcontroller 250. The speed controller supplies DC. current to the motorat an adjustable voltage in order to drive the roller 52 at the desiredspeed and, for the purpose of selecting and adjusting the speed, acontrolling device, such as a potentiometer having an adjusting knob252, is provided. Alternating current is supplied to the input side ofthe speedcontroller 250 through supply leads 254 and 256 whichareconnected to the lines 209 and 178, respectively. When the manualon-off switch 182 is in the off position, as shown, the speed controlleris not energized and, accordingly, operation of the motor in the normalclockwise direction is prevented.

In accordance with the invention, the drive motor ,76 may be operated'in a reverse (counterclockwise) direction when the manual on-off'switch182 is off, in order to clear a paper jam, or the like. For thispurpose, alternate terminals 258 and 260 of the manual reversing switch238 are supplied with reverse polarity, low voltage DC. power through afirst lead 262 connected to the terminal 184 through a rectifier 264,dropping resistor 266 and lead 186 and through a second lead 268connected to the A.C. supply terminal 174 through the lead 178.

When the reversing switch 238 is moved to the alternate or reverseposition, the motor leads 230 and 232 are connected to the alternateterminals 258 and 260 which provide low voltage DC for rotation of themotor 76 in a counterclockwise or reverse direction at a relatively lowspeed (for example, rpm). When the shaft 72 is rotated in reverse theslip clutch 78 permits overrunning of the roller 52 because of thenegative torque and, accordingly, the roller can be hand rotated in bothdirections to aid in rapidly clearing a paper jam.

The circuit 170, as it appears-in FIG. 3, is in the inoperative or offcondition. When it is desired to operate the developer apparatus 10 ofthe invention, the manual on-off switch 182 is depressed, causing thearmature 180 thereof to be moved from the terminal 184 to the terminal188, opening the connection to lead 183 and closing operating circuitsto pump motor 108 and the circuits powered through the lead 209 and the8normally closed contact 206 of time delay relay 20 o 3 At this time,applicator roller 52 starts to rotate as current is supplied through thespeed control device 250, and fluidis pumped from the reservoir to thetube for distribution onto the blade 86 and over the surface of theapplicator roller.

Power is applied through the normally closed contacts of the time delayrelay 108, via the lead 204 through the lead 220 and the normally closedcontacts 136a and leads 218 and 214 to the-motor engage coil 216. Whenthis occurs, rotation of the cam begins and after approximately 40 ofrotation into an intermediate position, contacts 136a are opened. Theopening of contacts 136a (Fl(i.4) de-energizes the engage coil 216 andstops the rotation of the cam. At thistime,

,both switchcontacts 136a, 136b are open and contact 138a isclosed. Bothcontacts 138a, 138!) are now in a closed condition and during the 40rotation of the cam, developer fluid was supplied to the metering blade86, which was brought into engagement with the applicator roller surface58.

During the 3-second delay time of relay 208, developer fluid flowingfrom apertures 103 in feed tube 100 is metered over the surface 58 ofroller 52. After the 3-second delay time is completed, relay armature207 moves from normally closed contact 206 to normally open contact 210.Power from'the 1 15 volt A.C. source now is provided again throughclosed contacts l38b to motor engage coil 216, once again to cause therotation of the cam member in the same direction. The cam rotates anadditional 80 from its intermediate position, and during the 80rotation, the switch contacts 138b are opened. The opening of thecontacts 138b breaks the connection from the power source to the engagecoil-216, de-energizing the cam motor and stopping the rotation of thecam.

During the lasfimentioned 809. rotation of the cam, no additionalmovement of blade member 86 was effected; however, the pressure applyingblade member 88 was moved into engagement with the surface ofapplicatorroller 52. Once both blades are in engagement with the rotatingapplicator roller, the developing apparatus is deemed to be in a runningcondition, and diazo copies may be fed through the developer section 50of the diazo copying machine 10 for processing. 4

Upon completion of the developing process, the developing apparatus isrestored to its normal unoperated state by operation of the manualon-otf switch 182 to its off position. In doing so, the. armature 1800fthe switch is moved from engagement with the terminal 188 intoengagement with the terminal 184, and the secondary armature 198 ismoved out of engagement with the terminal 200. This makes a connectionfrom the 1 15 volt A.C. source to motor release coil 190. The connectionis from the A.C. source via leads 176, 186, and through contacts 138awhich remain closed after cam rotation stopped. With motor release coil190 energized, the cam motor (FIG. 1) is operated to rotate the cam inan opposite direction and the cam is rotated a full back to the home ornormal position. During the last-described rotation, the blade members86, 88 are sequentially removed from engage- 9 ment with the applicatorroller, blade member 88 being disengaged first, followed by blade member86.

Once the cam is returned to the home position, the contacts 138a areopened to stop the motor 134. While the preferred means for moving theblade members 86, 88 into and out of engagement with the applicatorroller 52 is the cam andcircuit arrangement described above, it will beunderstood that such sequential movement could be obtained by othermeans, such as, for example, a series of gears arranged to control themovement of the blade members with a time delay arrangement operatingthe drive mechanism for the gears lt is therefore contemplated to coverby thepresentapplication any such equivalent means.

It has been explained that a preferred developing apparatus according tothe invention includes means for moving the blade members 86, 88 intoand outof engagement with the applicator roller sequentially asdescribed. Such sequential movement is important since it affords auniform wetting of the applicator roller prior to bringing the pressureapplying blade member into contact with the roller, thereby to allow fora faster starting time aswell as to prevent contact of the blade memberagainst a relatively dry roller surface which might have a detrimentaleffect thereon.

While it ispreferred in the subject apparatus to move the pressureapplying and wiper blade members toward and away from the applicatorroller, the result achieved thereby can also be achieved throughmovement of the roller toward and away from the blade members, as wellas through themovement of both the blade members and the roller towardand away from each other.

In the event that a paper jam should occur and -a piece of copy sheetbecomes wound around the roller 52, the manual on-off switch 182 isreturned to the off position wherein the armature of the switch is inengagement with the terminal 184. This causes the power supplied to thefluid pump 108 and speed controller 250 through the line 209 to becomediscontinued and the release coil 190 to effect movement of the blades86 and 88 to the disengaged or released position as previouslydescribed. v

a In order to clear the paper'from the roller 52, it is desirable to beable to rotate the roller manually in both directions. The manualreversing switch 238 is activated from the normal position (FIG. 3) tothe reversing position, as described previously, wherein the motor 76 isdriven in a reverse direction. When the motor is rotating in reversedirection, the roller 52 may be manipulated slowly in either directionbecause of the reverse drive and the action of the overruning slipclutch 78. The only limitation in this regard is that counterclockwisemanual rotation of the roller 52 does not exceed the speed of reverserotation of the shaft 72 so as to exert positive clockwise torquethrough the clutch. After the paper jam has been cleared by manipulationof the roller 52, the manual reversing switch is returned to the normalposition.

. Referring to FIG. 4, therein is illustrated another embodiment of adeveloper apparatus 12A for use in a diazotype copy apparatus 10 aspreviously described. The developer 12A differs from the developer 12ofthe previous embodiment in that a multiroller arrangement is utilizedincluding the liquid applicator roll 52, a pres sure woll 53, and awiper roll or rod 63.

.through a chain 75, sprocket 74, shaft 72, and one-way slip clutch78,'as previously described, and the pressure roll 53 is rotated in aclockwise direction by frictional contact with the applicator roll whencopy sheets are moved between the rolls from right to left, as indicatedby'the arrow A. The pressure roll 53 is carried on a shaft 55 supportedby suitable bearing arms 57 and is movable between an engaged and areleased position toward and away from contact with the applicator roll52 by the shaft 92. As in the prior embodiment, the tubular shaft 92 isrotated in opposite directions by the cam motor release and engagescoils 190 and 216, respectively, to move the pressure roll 53 into andout of pressure contact with the applicator roll 52.

The applicator roll 52 is mounted for rotation in a reservoir or pan 59containing liquiddeveloper and the outer' surface ,58 of the roll picksup the liquid developer for application to the copy sheet moving betweenapplicator roll and the pressure roll 53.

In order to insure a substantially uniform application of developerfluid over the outer surface 58 of the applicator roll 52, the developerincludes a wiper assembly 61 disposed longitudinally of .the roll abovethe level of liquid in the reservoir. The wiper assembly ineludes thewiper rod or roll 63 which is urged into con tact against the applicatorroll to wipe off or remove excess liquid developer from the roll surface58 before contact with the copy sheet. The rod 63 may be driven bycontact with the applicator roll 52 or may be positively driven by apair of meshing gears 65 and 67. In the former case, the wiper rod isjournaled for free rotation by suitable bearing means, ,while in thelatter case the diameter ratio of the gears '65 and 67 is such that therotational speed of the wiper'rod is in the range of approximately oneto two thirds that of the applicator roll 52 (preferably about onehalf).

The wiper rod or roll 63 is seated in a longitudinal V-' shaped grooveformed in the outerface of asupport bar 69 which is biased toward theapplicator roll 52 by a plurality of springs 71. The support bar isslidable in a U-shaped bracket 73 which, in turn, is attached to thetubular control shaft 90. The shaft 90, like the shaft 92, is rotated bythe cam motor engage and release coils 190 and 216 to move the wiperroll into and out of wiping contact with the applicator roll 52 bypivotal movement, as shown by the arrows in FIG. 4.

When the control shafts and 92 are rotated to the released position bythe cam release motor and associated control circuitry (FIG. 3), thepressure roll 53 and wiper roll 63 are moved out of contact with theapplicator roll 52 so that a paper jam may be readily cleared up, aspreviously described. The one-way clutch 78 and reversal of the drivemotor permit manual rotation of the applicator roll 52 in eitherdirection, as previously described.

While there has been illustrated and described several embodiments ofthe present invention, it will be appreciated that numerous changes andmodifications will occur to those skilled in the art, and it is intendedin the appended claims to cover all those changes and modificationswhich fall within the true spirit and scope of the present invention.

What is claimed as new and desired to be secured by Letters Patent ofthe United States is:

. with a copy sheet and contact means movable toward and away fromcontact with said roller between an engaged and a released position,drive means normally rotatively driving said roller in one direction forcopy making purposes and control means for moving said contact meansbetween said positions, slip clutch means permitting free rotation ofsaid roller in said one direction relative to said drive means and meansfor reversing said drive means whereby. said roller may be fully rotatedin both directions to facilitate removal of a copy sheet therefrom.

2. The copy machine of claim 1 wherein said reversing means includesmanual reversing switch means and reversing circuit means permittingenergization of terminals of said reversing switch means when saidcontrol means is in an off position and said contact means is in saidreleased position.

3. The copy machine of claim 2 wherein said control means includesmanual on-ofi switch means and control circuit means operative to movesaid blade means to said disengaged position when said on-off switchmeans is moved to an off position.

' 4. The copy machine of claim 3 wherein said control circuit means isconnected to supply power to said reversing means when said manualon-off switch means is in said off position.

5. The copy machine of claim 2 wherein said reversing switch means ismovable between a normal position for supplying current of one polarityto energize said drive means in said one direction and a reverseposition for supplying current of a reverse polarity to said drivemeans.

6. The copy machine of claim 1 wherein said contact means comprises atleast one blade means movable toward and away from tangential linecontact with said roller. I

7. The copy machine of claim 6 including a pair of said contact meansspaced circumferentially apart around said roller on opposite sidesthereof.

8. The copy machine of claim 1 wherein said contact means comprisespressure roll means for urging said copy sheet against said roller andmovable toward and away from contact therewith betweensaid engaged andsaid released positions.

reservoir means for developer fluid, said roller mounted adjacent saidreservoir whereby a portion of the outer surface thereof is wetted bysaid fluid, said contact means including wiper roll means between saidreservoir and said pressure roll means for removing excess fluid fromsaid roller surface.

10. The copy machine of claim 9 including means for positively drivingsaid wiper roll means at a velocity less than said roller.

11. The copy machine of claim 9 including means for supporting saidwiper roll means for free rotation in contact with said roller.

12. The copy machine of claim 9 wherein said conengaged and saidreleased positions.

9. The copy machine of claim 8 including liquid- UNITED CSTATEJSQPA-TENT OFFICE CERTIFICATE #OF CORRECTION Patent No. 3,7 9 DatedNovember '7, 197 2 Invent0r(s) John opeland It is certified that errorappears in the above-identified patent and that said Letters Patent arehereby corrected as shown below:

In the drawings, Sheet 1, Fig. l, the reference numeral 103 should beapplied to the aperture in the tubular conduit lOO; Fig.1, the referencenumeral ll r should be applied to the trough mounted beneath theapplicator roller 52 and the metering blade '86; Fig. l, the referencenumeral 116 should be applied to the opening at the bottom of the trough11M. Column 3 line 50, the referencenumeral 'f'su" should read n Column5, line 12, after "Contact" there should be inserted spaced line 13,."around should read on line 13, after "v'roller there should beinserted ---from--.

Column 8, line 1', the reference numeral @183" should read 186 --v.

. Column 9, line I, reference numeral "13M" should be deleted. Column10, line #6, "engage and" should be deleted; line H6, after releasethere shouldbe inserted and engage line H7, after reference numeral"216". there should be inserted 9- respectively,

Signed and .seal ed' this 17th day of April 1973.

(SEAL) Attest:

EDWARD M.ELETCHER,JR I 7 ROBERT 'GOTTSCHALK Attesting Officer 7Commissioner of Patents ORM PO-10 0 (1 uscoMM-Dc scam-Pee I, Q U.5.GOVERNMENT PRINTING OFFICE I969 0-;65-334 Patent No. 3,7 9 DatedNovember 7, 1972 Inventor(s) John p land It is certified that errorappears in the above-identified patent and that said Letters Patent arehereby corrected as shown below:

In the drawings, Sheet 1, Fig. l, the reference numeral 103 should beapplied to the aperture in the tubular conduit lOO; Fig.1, the referencenumeral 11H should be applied to the trough mounted beneath theapplicator roller 52 and the metering blade 86; Fig. l, the referencenumeral 116 should be applied to the opening at the bottom of the troughll l. Column 3 line 50, the reference numeral "8 1" should read 7 Column5, line 12, after "Contact" there should be inserted spaced line 13,"around" should read on line 13, after "roller" there should be insertedfrom". Column 8, line l, the reference numeral "183" should read 186Column 9, line H, reference numeral "13M" should be deleted. Column 10,line 16, "engage and" should be deleted; line 6, after "release" thereshould be inserted and engage line 17, after referenc numeral "216"there should be inserted respectively,

Signed and sealed this 17th day of April 1973 (SEAL) Attest:

EDWARD M.PLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissionerof Patents FORM Po-1050 (10-69) USCOMM-DC scam-P69 U.S. GOVERNMENTPRINTING OFFICE: I569 O366-334

1. In a copy machine employing a roller for contact with a copy sheetand contact means movable toward and away from contact with said rollerbetween an engaged and a released position, drive means normallyrotatively driving said roller in one direction for copy making purposesand control means for moving said contact means between said positions,slip clutch means permitting free rotation of said roller in said onedirection relative to said drive means and means for reversing saiddrive means whereby said roller may be fully rotated in both directionsto facilitate removal of a copy sheet therefrom.
 2. The copy machine ofclaim 1 wherein said reversing means includes manual reversing switchmeans and reversing circuit means permitting energization of terminalsof said reversing switch means when said control means is in an offposition and said contact means is in said released position.
 3. Thecopy machine of claim 2 wherein said control means includes manualon-off switch means and control circuit means operative to move saidblade means to said disengaged position when said on-off switch means ismoved to an off position.
 4. The copy machine of claim 3 wherein saidcontrol circuit means is connected to supply power to said reversingmeans when said manual on-off switch means is in said off position. 5.The copy machine of claim 2 wherein said reversing switch means ismovable between a normal position for supplying current of one polarityto energize said drive means in said one direction and a reverseposition for supplying current of a reverse polarity to said drivemeans.
 6. The copy machine of claim 1 wherein said contact meanscomprises at least one blade means movable toward and away fromtangential line contact with said roller.
 7. The copy machine of claim 6including a pair of said contact means spaced circumferentially apartaround said roller on opposite sides thereof.
 8. The copy machine ofclaim 1 wherein said contact means comprises pressure roll means forurging said copy sheet against said roller and movable toward and awayfrom contact therewith between said engaged and said released positions.9. The copy machine of claim 8 including liquid reservoir means fordeveloper fluid, said roller mounted adjacent said reservoir whereby aportion of the outer surface thereof is wetted by said fluid, saidcontact means including wiper roll means between said reservoir and saidpressure roll means for removing excess fluid from said roller surface.10. The copy machine of claim 9 including means for positively drivingsaid wiper roll means at a velocity less than said roller.
 11. The copymachine of claim 9 including means for supporting said wiper roll meansfor free rotation in contact with said roller.
 12. The copy machine ofclaim 9 wherein said contact means includes means for moving said wiperroll means toward and away from said roller between said engaged andsaid released positions.